Intraspecific Variation in the Purple Secretion of the California Sea Hare, Aplysia californica Cooper
نویسنده
چکیده
THE SEA HARE is probably best known because of the red to purple fluid secreted from the margin of its mantle. There is only a superficial resemblance between this secretion and that of the genus Mttrex, which is the source of the anciently famous dye, "Tyrian" or "Royal Purple." Aplysia purple, however, found no practical use, probably because of one important deficiency-it turns a dirty brown upon exposure to air and sunlight. Our knowledge of the nature and composition of aplysia purple has been increased periodically since DeNegri (1876) presented a series of beautifully colored spectra . The most significant of the early papers is that of MacMunn (1899), who attempted an analysis but concluded that there was no reason to believe that aplysia purple was composed of more than a single component. Durrien and Turchini (1925) published a minor observation which, unfortunately, was recognized as the oldest literature on the subject by some later authors . Schreiber (1932) presented the results of an extensive study of aplysia purple. He divided the purple into two components, one of which he showed to be a substance similar to urobilin and the other its precursor substance, which is also pigmented but very unstable. Fontaine and Raffy (1936) made suggestions as to the possible source of the
منابع مشابه
An Examination of the Antibacterial Effect of the Ink of Persian Gulf’s Sea Hare Aplysia dactylomela on Some Aquatic Pathogens
,Different variations of Aplysia have been appealing options in medical and pharmaceutical researches for years. Persian Gulf’s sea hare—Aplysia dactylomela—is a species native to Persian Gulf and can be evaluated in various areas. In this research, carried out in 2019 in Persian Gulf University’s Research Centre, the antibacterial potential of the ink of this species has been measured against ...
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The thermoregulatory behavior of sea hare Aplysia californica was determined in a horizontal thermal gradient; with a preferred temperature (PT) of 18.3 ̊C for the day cycle and 20.8 ̊C for the night cycle. The displacement velocity demonstrated an initial rate of 30 cm·h and gradually the velocity diminished to 18 cm·h with several fluctuations mainly at 02:00 am. Critical Temperature Maxima (CT...
متن کاملMolecular Identification of the Persian Gulf Sea Hare (Aplysia sp.) Based on 16s rRNA Gene Sequence
Background: Sea hares of the Aplysia genus are among the mollusks of interest for various researchers to study their phylogeny, bioactive compounds and the nervous system. These mollusks are herbivorous and produce chemical compounds (ink) to defend themselves. The present study provided molecular identification of the Persian Gulf (Bushehr city) sea hare using 16s rRNA gene sequence. Materials...
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تاریخ انتشار 2009